There likely haven't been many posts about this combo since /SD offers "most" of what /SR does, although with the tradeoff of lower DDR/less recharge for additional damage buff/more HPs/more resistance/AoE nuke. Also, KM Scrappers benefit greatly from even more +Dam from the secondary, hence the proliferation of KM/SD and KM/FA combos, two combos which also shore up the relative lack of AoE in KM itself.
None of that is meant to shoot down the idea of KM/SR, of course; totally viable option, there.
I'm surprised that I haven't seen on on here. I'd think these two would mesh well, don't get hit because of SR and when you do get hit you don't take as much dmg because of KM. So, anyone want to take a crack at this?